CN220224979U - Height-adjustable cast-in-situ box girder formwork system - Google Patents

Abstract

The utility model discloses a height-adjustable cast-in-place box girder formwork system, wherein a box girder side formwork comprises an inner concave arc plate, a height-adjustable connecting piece is symmetrically connected to the outer arc surface of the inner concave arc plate at the midspan position of the inner concave arc plate, an outer convex arc plate is connected to one end of the height-adjustable connecting piece, which is far away from the inner concave arc plate, the height-adjustable connecting piece can enable the inner concave arc plate to be close to or far away from the outer convex arc plate, a plurality of side formwork square woods which are arranged at intervals are erected on the height-adjustable connecting piece, first edges of the inner concave arc plate and the outer convex arc plate are respectively and smoothly contacted with a box girder bottom die and a box Liang Yimo, second edges of the inner concave arc plate and the outer convex arc plate are respectively and smoothly contacted with the upper surfaces of the side formwork square woods, and the side formwork panels are jointly supported on the inner concave arc plate, the outer convex arc plate and the side formwork square woods. The utility model aims to solve the problems of incapability of adjusting the height, poor flexibility, low turnover utilization rate, difficult template transportation, storage and hoisting processes, and high construction difficulty and cost.

Description

Height-adjustable cast-in-situ box girder formwork system

Technical Field

The utility model belongs to the technical field of cast-in-situ box girder construction in bridge engineering, and particularly relates to a height-adjustable cast-in-situ box girder formwork system.

Background

Along with the continuous construction of highway networks in China, the number and the scale of highway bridges are continuously increased, and the requirement for bridge construction is still high. The cast-in-situ box girder construction method is widely applied to bridge construction due to good integrity and relatively mature process flow. The supporting template system is a key factor of quality control in the construction of the cast-in-situ box girder.

The patent application with the publication number of CN110158479A discloses an arc-shaped support combined template for a cast-in-situ box girder and a erecting method thereof, and the arc-shaped support combined template for the cast-in-situ box girder solves the problems of heavy lifting and transporting tasks, lower efficacy and high cost of a steel template and a support of a side template (a belly template and a wing template) of the cast-in-situ box girder, but the height of the arc-shaped support combined template for the cast-in-situ box girder cannot be adjusted, has poor flexibility and low turnover utilization rate, cannot be applied to other projects with different girder heights, and increases the construction cost; in addition, the belly template and the wing template of the arc-shaped support combined template for the cast-in-situ box girder are integral continuous steel templates, the structure is heavy, difficulties in template transportation, storage and hoisting still exist, and the construction difficulty is increased.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides a height-adjustable cast-in-situ box girder formwork system, which aims to solve the problems of incapability of adjusting height, poor flexibility, low turnover utilization rate, difficult template transportation, storage and hoisting processes and high construction difficulty and cost.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

according to a first aspect of the utility model, a height-adjustable cast-in-situ box girder formwork system is provided, which comprises a box girder bottom die, box girder side dies connected to two ends of the box girder bottom die and box girder wing dies connected to two ends of the box girder side dies;

the box girder side die comprises an inner concave arc plate, a height-adjustable connecting piece is symmetrically connected to the outer arc surface of the inner concave arc plate at the midspan position of the inner concave arc plate, one end, far away from the inner concave arc plate, of the height-adjustable connecting piece is connected with an outer convex arc plate, the inner concave arc plate can be close to or far away from the outer convex arc plate, a plurality of side die square boards which are arranged at intervals are erected on the height-adjustable connecting piece, the first edges of the inner concave arc plate and the outer convex arc plate are respectively in smooth contact with the bottom die of the box girder and the wing die of the box girder, the second edges of the inner concave arc plate and the outer convex arc plate are respectively in smooth contact with the plane where the upper end faces of a plurality of side die square boards are located, and the inner concave arc plate, the outer convex arc plate and a plurality of side die square boards are jointly supported with the side die square boards.

In one possible implementation manner of the first aspect, the height-adjustable connecting piece includes a connecting lug plate, a strip-shaped connecting plate and a bolt and nut piece, the connecting lug plate is fixed on an outer arc surface of the concave arc plate, a first through hole is formed in the connecting lug plate, the upper end of the strip-shaped connecting plate is connected with the outer arc plate, a plurality of second through holes are formed in the strip-shaped connecting plate at intervals along the length direction, and the first through hole in the connecting lug plate is connected with any second through hole in the strip-shaped connecting plate through the bolt and nut piece after being in butt joint.

In a possible implementation manner of the first aspect, the upper end of the elongated connecting plate is detachably connected to the convex arc plate through the bolt-nut member.

In a possible implementation manner of the first aspect, the box girder bottom die includes a plurality of steel girders arranged at intervals along a width direction of the box girder, a plurality of bottom die square lumber orthogonal to the steel girders are arranged at intervals on the plurality of steel girders, and bottom die panels are supported on the plurality of bottom die square lumber; the first edge of the concave circular arc plate is in smooth contact with the upper end surfaces of the bottom die square timber, and the bottom die panel is in butt joint with the lower end of the side die panel.

In a possible implementation manner of the first aspect, the bottom die of the box girder further includes a plurality of first uprights supported at the bottom of the steel girder.

In a possible implementation manner of the first aspect, the box girder wing mold includes a wing mold square wood in smooth contact with the first edge of the outer convex circular arc plate, and a wing mold panel is supported on the wing mold square wood, and the wing mold panel is in butt joint with an upper end of the side mold panel.

In a possible implementation manner of the first aspect, the box girder airfoil further includes a plurality of second uprights supported at the bottom of the airfoil.

In a possible implementation manner of the first aspect, a plurality of the second uprights are connected in sequence by a horizontal pull rod.

In a possible implementation manner of the first aspect, the side die of the box girder further includes a diagonal rod supported on the height-adjustable connection member, and the diagonal rod is connected to the second upright.

According to a second aspect of the utility model, there is provided a method of erecting a height-adjustable cast-in-place box girder formwork system, comprising:

supporting a box girder bottom die and a box Liang Yimo;

through adjusting the height-adjustable connecting piece, make indent circular arc board extremely after the interval of evagination circular arc board accords with the formwork requirement of waiting to construct the case roof beam, will indent circular arc board with the first limit of evagination circular arc board respectively with prop up established the case roof beam die block with the case roof beam wing die smooth contact a plurality of side form square timber of interval arrangement set up on the height-adjustable connecting piece, make a plurality of the up end place plane of side form square timber with indent circular arc board with the second limit smooth contact of evagination circular arc board set up side form panel on indent circular arc board evagination circular arc board and the side form square timber.

Compared with the prior art, the utility model has at least the following beneficial effects:

according to the height-adjustable cast-in-situ box girder formwork system, the inner concave arc plates and the outer convex arc plates are connected through the height-adjustable connecting pieces, the inner concave arc plates are in smooth contact with the bottom formwork of the box girder, and the outer convex arc plates are in smooth contact with the box Liang Yimo, so that when the cast-in-situ box girder formwork system is used for casting box girders with different girder heights, the distance between the inner concave arc plates and the outer convex arc plates is adjusted and changed by utilizing the height-adjustable connecting pieces according to the box heights to be constructed, the construction requirements can be met, casting of the box girders with different girder heights can be realized, and the arc angles of the box girders can be kept unchanged. The concave arc plates are in smooth contact with the bottom die of the box girder, the convex arc plates are in smooth contact with the wing die of the box girder, the structure is subjected to block splicing operation, transportation, storage and hoisting of the template components are facilitated, and the construction difficulty is reduced. In conclusion, the utility model effectively solves the problems of incapability of adjusting the height, poor flexibility, low turnover utilization rate, difficult template transportation, storage and hoisting processes, and high construction difficulty and cost.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall axial side of a height-adjustable cast-in-situ box girder formwork system according to an embodiment of the present utility model;

FIG. 2 is a partially enlarged schematic axial view of a formwork system for a height-adjustable cast-in-situ box girder according to an embodiment of the present utility model;

fig. 3a and fig. 3b are schematic diagrams of two views of connection of an inner concave arc plate, a height-adjustable connecting piece and an outer convex arc plate in a height-adjustable cast-in-situ box girder formwork system according to an embodiment of the present utility model;

fig. 4a, fig. 4b and fig. 4c are schematic views of the height adjusting states of the concave arc plate, the height adjustable connecting piece and the convex arc plate in the height adjustable cast-in-situ box girder formwork system according to the embodiment of the utility model;

FIG. 5 is a schematic diagram of the overall axial side of a height-adjustable cast-in-situ box girder formwork system (including box girders) according to an embodiment of the present utility model;

fig. 6 is an overall schematic front view of a height-adjustable cast-in-situ box girder formwork system (including box girders) according to an embodiment of the utility model.

In the figure: 1-a box girder bottom die; 100-steel beams; 101-bottom die square timber; 102-a bottom die panel; 103-a first upright;

2-box girder side molds; 200-concave arc plates; 201-height adjustable connector; 2010-attaching an ear plate; 2011-a strip-shaped connecting plate; 2012—bolt nut pieces; 202-an outer convex arc plate; 203-side mold square timber; 204-side mold panels; 205-diagonal bar;

3-box girder wing mold; 300-wing die square timber; 301-wing die panels; 302-a second upright; 303-a horizontal pull rod;

4-box girders.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 and 2, the embodiment of the utility model provides a height-adjustable cast-in-situ box girder formwork system, which comprises a box girder bottom formwork 1, box girder side formworks 2 connected to two ends of the box girder bottom formwork 1, and box girder wing formworks 3 connected to two ends of the box girder side formworks 2. Specifically, as shown in fig. 3a and 3b, the side mold 2 for a box girder includes a concave arc plate 200, a height-adjustable connecting piece 201 is symmetrically connected to the outer arc surface of the concave arc plate 200 at the midspan position thereof, one end of the height-adjustable connecting piece 201, which is far away from the concave arc plate 200, is connected with an outer arc plate 202, and the height-adjustable connecting piece 201 can enable the concave arc plate 200 to be close to or far away from the outer arc plate 202, that is, the position of the concave arc plate 200 relative to the outer arc plate 202 can be changed by adjusting the height-adjustable connecting piece 201, so that the side mold is suitable for box girder construction projects with different girder heights. As shown in fig. 2, a plurality of side mold square timber 203 are arranged on the height-adjustable connecting piece 201 at intervals, first edges of the concave arc plate 200 and the convex arc plate 202 are respectively and smoothly contacted with the box girder bottom die 1 and the box girder wing die 3, second edges of the concave arc plate 200 and the convex arc plate 202 are respectively and smoothly contacted with planes where upper end surfaces of the plurality of side mold square timber 203 are located, and side mold panels 204 are commonly supported on the concave arc plate 200, the convex arc plate 202 and the plurality of side mold square timber 203. Specifically, the side mold plate 204 is a bamboo plywood, and the side mold plate 204 is connected and fixed with the side mold square timber 203 through iron nails.

Specifically, in the height-adjustable cast-in-situ box girder formwork system of the embodiment, because the concave arc plate 200 and the convex arc plate 202 are connected through the height-adjustable connecting piece 201, the concave arc plate 200 is in smooth contact with the box girder bottom die 1, and the convex arc plate 202 is in smooth contact with the box girder wing die 3, when the cast-in-situ box girder formwork system is used for a box girder construction scene with different girder heights, only the distance between the concave arc plate 200 and the convex arc plate 202 needs to be adjusted and changed by utilizing the height-adjustable connecting piece 201 according to the box height to be constructed, the construction requirements can be met, the casting of box girders with different girder heights can be realized, and the arc angle of the box girder can be ensured to be kept unchanged. Meanwhile, the concave arc plate 200 of the embodiment is in smooth contact with the bottom die 1 of the box girder, the convex arc plate 202 is in smooth contact with the wing die 3 of the box girder, and the structure is subjected to block splicing operation, so that the template components are convenient to transport, store and hoist, and the construction difficulty is reduced.

In some embodiments, as shown in fig. 3a and 3b, the height-adjustable connection piece 201 includes a connection lug plate 2010, an elongated connection plate 2011, and a bolt-nut 2012, where the connection lug plate 2010 is fixed on the outer arc surface of the concave arc plate 200, and the connection lug plate 2010 is provided with a first through hole, for example, the connection lug plate 2010 is fixedly connected on the outer arc surface of the concave arc plate 200 by welding. The upper end of rectangular connecting plate 2011 is connected with evagination circular arc board 202, is equipped with a plurality of second through-holes along length direction interval on the rectangular connecting plate 2011, and the first through-hole on the connection otic placode 2010 is connected through bolt nut spare 2012 after the butt joint with arbitrary second through-hole on the rectangular connecting plate 2011. For example, two first through holes are formed in the connection lug plate 2010, nine second through holes are formed in the long connection plate 2011 at intervals along the length direction, and the bolt and nut 2012 is made of carbon steel.

As shown in fig. 4a, 4b and 4c, the distance between the concave arc plate 200 and the convex arc plate 202 is adjusted and changed by using the height-adjustable connection piece 201, specifically: after the bolt and nut piece 2012 is disassembled, the first through hole on the connecting lug plate 2010 is abutted with the second through hole meeting the box girder construction height position on the strip-shaped connecting plate 2011, and the bolt and nut piece 2012 is utilized to penetrate into the first through hole and the corresponding second through hole for fastening connection, so that the operation is convenient and quick, the design cost is low, and the disassembly and the transportation are convenient. For example, fig. 4a shows the adjusted position when the height of the box girder is low; FIG. 4b illustrates the adjusted position when the beam height is low a second time; fig. 4c shows the adjusted position when the height of the box girder is large.

Preferably, as shown in fig. 3a and 3b, the upper end of the strip-shaped connecting plate 2011 is detachably connected with the outer convex arc plate 202 through a bolt and nut member 2012, so that the design is more beneficial to the disassembly, assembly, transportation and hoisting installation of the cast-in-situ box girder formwork component.

In this embodiment, the concave arc plate 200, the height-adjustable connecting piece 201 and the convex arc plate 202 are all manufactured by processing steel plates, holes are formed on the strip-shaped connecting plate 2011 according to the field requirements, and the effect of adjusting the height of the template can be achieved by adjusting the connecting hole positions. Preferably, as shown in fig. 3a and 3b, a plurality of stiffening plates (steel plates) are further provided on the outer arc surface of the concave arc plate 200 for enhancing the stability of the concave arc plate 200. The stiffening plates at both ends of the concave arc plate 200 are provided with connecting holes, specifically, as shown in fig. 3a and 3b, a structural unit is shown, and the segments are connected according to the site construction requirement, and the segments are connected by penetrating bolts into the connecting holes provided on the stiffening plates.

In an embodiment, as shown in fig. 1 and 2, the bottom die 1 of the box girder includes a plurality of steel beams 100 arranged at intervals along the width direction of the box girder, and the steel beams 100 are exemplified as i-beams. A plurality of bottom die square timber 101 orthogonal to the steel beams 100 are arranged on the plurality of steel beams 100 at intervals, bottom die face plates 102 are supported on the plurality of bottom die square timber 101, namely, the bottom die face plates 102 are supported by the plurality of steel beams 100 and the plurality of bottom die square timber 101 orthogonal to the steel beams, and the bottom die square timber 101 plays roles of supporting and load transferring. The first edge of the concave arc plate 200 is in smooth contact with the upper end surfaces of the bottom die square timber 101, and the bottom die panel 102 is in butt joint with the lower ends of the side die panels 204. For example, the bottom die plate 102 adopts a bamboo plywood, and the bottom die plate 102 is connected with the bottom die square timber 101 through iron nails, so as to play a role in fixation.

On the basis of the above embodiment, as a more preferable embodiment, as shown in fig. 2, the box girder bottom die 1 further includes a plurality of first vertical rods 104, a plurality of first vertical rods 104 are supported at the bottom of each steel girder 100, and the first vertical rods 104 are utilized to realize the integral support of the steel girders 100, the bottom die square lumber 101 and the bottom die panel 102, and bear the box girders and the construction load and transmit the same to the foundation. The first upright 104 is made of Q235 hollow steel pipes.

In an embodiment, as shown in fig. 1 and 2, the box girder wing mold 3 comprises a wing mold square wood 300 which is in smooth contact with the first edge of the outer convex arc plate 202, a wing mold panel 301 is supported on the wing mold square wood 300, and the wing mold panel 301 is abutted with the upper end of the side mold panel 204, so that the smooth butt joint of the box girder side mold 2 and the box girder wing mold 3 is realized. For example, the wing die panel 301 is a bamboo plywood, and the wing die panel 301 and the wing die square wood 300 are connected by iron nails to play a role in fixation.

On the basis of the above embodiment, as a more preferable embodiment, as shown in fig. 2, the box girder airfoil 3 further includes a plurality of second uprights 302, and a plurality of second uprights 302 are supported at the bottom of each airfoil square log 300, and the second uprights 302 are used to realize integral support of the airfoil square log 300 and the airfoil panel 301. Similarly, the second upright rod 302 is made of Q235 hollow steel pipe.

More preferably, the plurality of second vertical rods 302 are sequentially connected through the horizontal pull rod 303, and the plurality of second vertical rods 302 are connected to form a whole by using the horizontal pull rod 303, so that the stability and the reliability of the whole support of the plurality of second vertical rods 302 on the wing die square timber 300 and the wing die panel 301 are improved. The horizontal pull rod 303 is made of Q235 hollow steel pipe.

In an embodiment, as shown in fig. 1 and fig. 2, the side die 2 of the box girder further includes a diagonal rod 205 supported on the height-adjustable connecting member 201, where the diagonal rod 205 is connected to the second upright rod 302, that is, the diagonal rod 205 is used to implement integral support for the concave arc plate 200, the height-adjustable connecting member 201, the convex arc plate 202, the side die square timber 203 and the side die plate 204, and the diagonal rod is effectively matched with the second upright rod 302 during support, so that the occupied space is small. Illustratively, the diagonal rod 205 and the second vertical rod 302 are fixed together by a steel buckle to form a whole, and the steel material is used as the material.

Referring to fig. 5 and 6, the method for supporting a height-adjustable cast-in-situ box girder formwork system according to the embodiment of the utility model specifically comprises the following steps:

1. scaffold building

The scaffold adopts a disc buckle type scaffold, the diameter of a steel pipe is 48mm, the wall thickness of the pipe is 3.25mm, and the material is Q235 carbon structural steel. The scaffold is divided into vertical rods, horizontal pull rods and inclined rods (9), the distance between the vertical rods is 0.6m, the horizontal pull rods are connected through circular disc buckles, and the inclined rods are connected with the vertical rods through connecting buckles to form a whole. I10I-steel is placed at the top end of the frame body below the bottom die panel, the direction is consistent with the trend of the bridge, and the interval is 0.6m; placing 100mm multiplied by 100mm bottom die square timber above the I-shaped steel, wherein the direction is vertical to the trend of the bridge; and paving a bottom die panel above the bottom die square wood, and adopting a 10mm thick bamboo plywood.

2. Steel rib plate assembly (concave arc plate, height adjustable connector and convex arc plate assembly)

The steel rib plate consists of an inner concave arc plate, a height-adjustable connecting piece and an outer convex arc plate, wherein a connecting lug plate and a stiffening plate are welded on the outer arc surface of the inner concave arc plate, and all components of the steel rib plate are designed and prefabricated according to the field condition. The connecting lug plate, the strip-shaped connecting plate and the outer convex arc plate are reserved with holes in advance, the connecting lug plate, the strip-shaped connecting plate and the outer convex arc plate are sequentially connected from bottom to top through the bolt and nut pieces, and the connecting holes of the connecting lug plate and the strip-shaped connecting plate are adjusted, so that the effect of adjusting the height of the inner concave arc plate can be achieved.

3. System connection

Lifting the steel rib plate to a designed position by using a crane, wherein the steel rib plate is supported by side die square timber, and the side surface is supported by an inclined rod; the two steel rib plates are connected by bolts, and the connection positions are stiffening plates at the two ends of the concave arc plate; binding 100mm multiplied by 100mm side die square timber with iron wires at the connecting rod position of the steel rib plate along the trend position of the bridge, wherein the square timber spacing is determined by the height of the strip-shaped connecting plate and is uniformly arranged and is not more than 300mm; the side mold panel is bent along the arc direction of the steel rib plate by adopting a 10mm thick bamboo plywood, is fixedly connected with a side mold square timber through iron nails, and is cut or spliced and adjusted according to the size of a box girder, and the two bamboo plywood are filled with foam rubber and polished to be smooth. And after the supporting of the height-adjustable cast-in-situ box girder supporting system is finished, pouring the box girder 4.

The supporting template is designed into a steel rib plate mode through modeling calculation and deepening design on stress of the template at the web plate and the flange plate, steel consumption is reduced on the premise of guaranteeing structural strength and stability, and the bamboo plywood is used in a combined mode, so that the dead weight of the structure is reduced, and the material cost is saved. The templates are processed in a sectional manner in the length direction of the bridge, so that construction and hoisting are facilitated; the height of the whole formwork system is adjustable in the height direction by adopting a three-section design and a height-adjustable connecting piece, the applicability of the formwork system is improved, the turnover utilization rate of the formwork system is improved, the whole formwork system has high flexibility and is accurately connected and fixed, and the construction quality of the cast-in-situ box girder is reliable, green and safe.

The height-adjustable cast-in-situ box girder formwork system of the embodiment has the following advantages:

1. the formwork system is designed into a rib plate form, so that the steel consumption is reduced on the premise of ensuring the structural strength and stability, and the bamboo plywood is used in a combined mode, so that the dead weight of the structure is reduced, and the material cost is saved;

2. the formwork system adopts sectional design in the length direction and the height direction of the bridge, so that the height and the length of the whole formwork system can be adjusted, the applicability of the formwork system is improved, and the turnover utilization rate of the formwork system is improved;

3. the formwork system structure is simple and reliable in connection, convenient to install and detach, high in combination degree with a scaffold, small in operation difficulty and high in construction efficiency.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "bottom", "inner", "outer", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "connected," and the like are to be construed broadly, and may be fixedly connected, detachably connected, or integrally formed, for example; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Finally, it should be noted that: the above examples are only specific embodiments of the present utility model, and are not intended to limit the scope of the present utility model, but it should be understood by those skilled in the art that the present utility model is not limited thereto, and that the present utility model is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (9)

1. The height-adjustable cast-in-situ box girder formwork system is characterized by comprising a box girder bottom formwork (1), box girder side formworks (2) connected to two ends of the box girder bottom formwork (1) and boxes Liang Yimo (3) connected to two ends of the box girder side formworks (2);

the box girder side die (2) comprises an inner concave arc plate (200), a height-adjustable connecting piece (201) is symmetrically connected to the outer arc surface of the inner concave arc plate (200) at the midspan position of the inner concave arc plate, one end of the height-adjustable connecting piece (201), which is far away from the inner concave arc plate (200), is connected with an outer convex arc plate (202), the height-adjustable connecting piece (201) can enable the inner concave arc plate (200) to be close to or far away from the outer convex arc plate (202), a plurality of side die square boards (203) which are arranged at intervals are arranged on the height-adjustable connecting piece (201), the first edges of the inner concave arc plate (200) and the outer convex arc plate (202) are respectively in smooth contact with the box girder bottom die (1) and the box girder wing die (3), the second edges of the inner concave arc plate (200) and the outer arc plate (202) are respectively in smooth contact with a plurality of upper end faces of the side die square boards (203), and the inner concave arc plate (200), the inner concave arc plate (200) and the outer arc square boards (203) are connected with the side die square boards (204).

2. The height-adjustable cast-in-situ box girder formwork system according to claim 1, wherein the height-adjustable connecting piece (201) comprises a connecting lug plate (2010), a strip-shaped connecting plate (2011) and a bolt nut piece (2012), the connecting lug plate (2010) is fixed on an outer cambered surface of the concave circular arc plate (200), a first through hole is formed in the connecting lug plate (2010), the upper end of the strip-shaped connecting plate (2011) is connected with the outer convex circular arc plate (202), a plurality of second through holes are formed in the strip-shaped connecting plate (2011) at intervals along the length direction, and the first through hole in the connecting lug plate (2010) is connected with any second through hole in the strip-shaped connecting plate (2011) through the bolt nut piece (2012) after being in butt joint.

3. The height-adjustable cast-in-situ box girder formwork system as claimed in claim 2, wherein the upper end of the strip-shaped connecting plate (2011) is detachably connected with the outer convex arc plate (202) through the bolt and nut piece (2012).

4. The height-adjustable cast-in-situ box girder formwork system according to claim 1, wherein the box girder bottom formwork (1) comprises a plurality of steel girders (100) which are arranged at intervals along the width direction of the box girder, a plurality of bottom formwork square timber (101) which are orthogonal to the steel girders (100) are arranged on the plurality of steel girders (100) at intervals, and a bottom formwork panel (102) is supported on the plurality of bottom formwork square timber (101); the first edge of the concave circular arc plate (200) is in smooth contact with the upper end surfaces of the bottom die square timber (101), and the bottom die panel (102) is in butt joint with the lower ends of the side die panels (204).

5. The height-adjustable cast-in-situ box girder formwork system as claimed in claim 4, wherein said box girder bottom formwork (1) further comprises a plurality of first uprights (104) supported at the bottom of said steel girder (100).

6. The height-adjustable cast-in-situ box girder formwork system according to claim 1, wherein the box girder wing formwork (3) comprises a wing formwork square timber (300) which is in smooth contact with the first edge of the outer convex arc plate (202), a wing formwork panel (301) is supported on the wing formwork square timber (300), and the wing formwork panel (301) is in butt joint with the upper end of the side formwork panel (204).

7. The height-adjustable cast-in-situ box girder formwork system as claimed in claim 6, wherein said box girder wing formwork (3) further comprises a plurality of second uprights (302) supported at the bottom of said wing formwork square timber (300).

8. The height-adjustable cast-in-situ box girder formwork system as claimed in claim 7, wherein a plurality of the second uprights (302) are sequentially connected by horizontal tie rods (303).

9. The height-adjustable cast-in-situ box girder formwork system as claimed in claim 7, wherein said box girder side formwork (2) further comprises a diagonal rod (205) supported on said height-adjustable connection (201), said diagonal rod (205) being connected to said second upright (302).